import java.util.Scanner;

/**
 * This class demonstrates the use of the Scanner class.
 */
public class Input
{
    /**
     * This takes input, but BlueJ has to be involved: It pops up a dialog box
     * and asks the user for a String that can be passed to this method. We
     * can't call something like this without BlueJ, if we want the user to
     * provide input.
     */
    public void printName(String name) {
        System.out.println("Hi "+name);
    }
    
    /**
     * This interacts with the user via Java code (a Scanner) to get the string
     * that's passed to printName. This would work without BlueJ
     */
    public void callPrintName() {
        Scanner s = new Scanner(System.in);
        String name = s.nextLine();
        printName(name);
    }
    
    /**
     * This sample code shows the creation of a Scanner object that reads from
     * the keyboard (System.in). This is different from the method above -- we
     * don't need BlueJ's help. We're interacting directly with the user.
     */
    public void getSomeInputs() {
        Scanner s = new Scanner(System.in); // Create scanner to read from keyboard
        System.out.println("What's your name?");
        String name = s.nextLine();
        System.out.println("Hi "+name+". How many cats do you have?");
        int numCats = s.nextInt();
        if (numCats > 3) {
            System.out.println("That's too many!");
            System.out.println("You should get rid of "+numCats/2+".");
        }
        else {
            System.out.println("I guess that's ok...");
        }
    }

    /**
     * This method prompts the user for an int and keeps at them
     * until they eventually enter an int.
     */
    public int getInt() {
        Scanner scan = new Scanner(System.in); // Watches keyboard for input
        System.out.println("Please enter an integer: ");
        while(!scan.hasNextInt()) {
            //System.out.println("That's not an integer!");
            String garbage = scan.next();  // Consume the stuff that wasn't an integer.
            System.out.println(garbage+" is not an integer! Try again.");
        }
        int num = scan.nextInt();
        return num;
    }
    
    /**
     * Prompts the user to enter an integer, over and over again until
     * they enter a -1, and the returns the average of the inputs.
     * This code assumes that the user behaves themselves and always
     * inputs integers.
     */
    public double averageUserInputs() {
        Scanner s = new Scanner(System.in);  // Scanner watches keyboard
        int sum = 0;
        int count = 0;
        int value = s.nextInt(); // Read the next integer
        while(value != -1) {
            sum = sum + value;
            count = count + 1;
            value = s.nextInt();
        }
        return sum / (double)count;
    }

}